This editor bundles all fence-rendering libraries (highlight.js, Mermaid, DOMPurify, Leaflet, Three.js, ABCJS, Vega, Vega-Lite, Vega-Embed, MathJax) into a single ~7.7 MB file (~1.0 MB gzipped). No CDN requests, no lazy loading — everything renders instantly and works fully offline or in air-gapped environments.